Bicycles can be ridden by everyone regardless of their age and level of fitness. Riding bicycles has a great impact on the cardiovascular system and is one of the ideal ways to improve general physical fitness. Before riding it is important to have a good warm-up stretching. This will help the body to prepare for the physical demands, but also to prevent possible injury due to overuse. Liquids should be taken regularly, regardless of thirst. Regular means 0.75 liters of fluid every hour. Along with sweat the electrolytes are lost, and the reimbursement of clean water is sufficient only if the journey takes up to an hour and a half. It is considered ideal to ride a bike three times a week - if you\'re not in shape, start with a ride of about twenty minutes, constant speed, and then every da...